<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
     const p = new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve('a')
        }, 4000);
     })

     async function demo(){
      const result = await p
      console.log(result);
      console.log(100);
     }
     demo()

     // 翻译之后的效果
     /* 
        p.then(
          result => {
             console.log(result);
             console.log(100);
          }
        )
     */
     // 先输出的1再输出的result
     console.log(1);

  </script>
</body>
</html>